If the entry cache for a suffix is large enough to hold most of the
entries in the suffix and if the cache is primed, the hit ratio (entrycachehitratio) should be high.

If you have primed the cache, you will see that as the previously empty
entry cache fills, entry cache size (currententrycachesize)
approaches the maximum entry cache size (maxentrycachesize).
Ideally, the size in entries (currententrycachecount) should
be either equal to or very close to the total number of entries in the suffix
(ldapentrycachecount).